I must be dense. I still cannot find any reference to "Kickstarter." I see pre-order, unreleased, released, etc. Is there a literal "Kickstarter" option or are you saying that the Kickstarter items are intermingled with other pre-order/unreleased items?
Once you choose the pre-order filter, the options for the other filters will change. It's a two-step process to get to the Kickstarter filters.